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another potential aesthetic source of Yume Nikki: some of the stuff in graffiti world kind of resembles paintings by Taro Okamoto
With another World Expo underway at Osaka this year, a massive park to the North of the city (actually in the neighbouring city of Suita) sits on the site of the first Japanese World Expo in 1970. There's usually some form of centrepiece: in 1889 it was the Eiffel Tower, and at Osaka Expo '70, it was the Tower of the Sun.
It is a massive sculpture by Taro Okamoto, which it was possible to climb into to view another work called the Tree of Life. As it was going to have people inside, it needed a lightning rod - that's what the top face (officially a mask, but I tend to call it the "bird face" - whose eyes light up at night apparently) is sporting. The three faces on the back, front and top represent humanity's past, present and future respectively, though some art critics and historians have a more bleak interpretation due to Okamoto's larger body of work and stance against technological progress, something the Expo would put emphasis on.
Similarly to the Eiffel Tower, the Tower of the Sun was supposed to be a relatively ephemeral structure, and nearly all the Expo pavilions around it have been demolished. Like the Eiffel Tower, it was avant-garde and no doubt not everyone liked it. But this building is one of the few to be preserved, and requires regular attention - again, like the Eiffel Tower which needs periodic repainting. In any case, the Tower of the Sun is one of Osaka's most iconic landmarks.